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Effect of Extended Conjugation of N‑Heterocyclic Carbene-Based Sensitizers on the Performance of Dye-Sensitized Solar Cells

Abstract

We report the synthesis, characterization, and photovoltaic properties of four ruthenium complexes (<b>CI101</b>, <b>CBTR</b>, <b>CB111</b>, and <b>CB108</b>) having various N-heterocyclic carbene ancillary ligands, pyridine-imidazole, -benzimidazole, -dithienobenzimidazole, and -phenanthroimidazole, respectively. These complexes were designed to investigate the effect of extended conjugation ordained from ring fusion on the power conversion efficiencies of the solar cells. The device sensitized by <b>CB108</b>, the pyridine-phenanthroimidazole conjugated complex, showed an improved efficiency (9.89%) compared to those of pyridine-benzimidazole conjugated system (<b>CBTR</b>, 9.72%) and the parent unfused ring system (<b>CI101</b>, 6.24%). Surprisingly, the sulfur-incorporated pyridine-dithienobenzimidazole system (<b>CB111</b>, 9.24%) exhibited a little lower efficiency than that of <b>N719</b> (9.41%). The enhanced photovoltaic performance of <b>CB108</b> was mainly attributed to the increase in electron lifetime and diffusion length confirmed by the electrochemical impedance spectroscopy

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The Francis Crick Institute

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Last time updated on 12/02/2018

This paper was published in The Francis Crick Institute.

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